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Old 02-22-2004, 01:03 PM
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Join Date: Nov 2002
Location: Nebraska
Posts: 58
Starter problems or something else?

I have a 1975 450SL. Last spring it wouldn't start and the mechanic said the starter was bad, so we replaced the starter with a rebuilt one. Everything went fine until one day it didn't want to start and when I let up on the ignition switch (even pulled the key out) the starter kept cranking. I quickly removed the battery cable. Since the ignition switch had been feeling a little funny I thought that was my problem so I tore into the dash and when I removed the starter switch it fell into two pieces, so I ordered a new switch and installed it. Now when I go to start the car, the starter keeps cranking still. Any ideas, do I have a bad starter, a bad solenoid, or where do I start looking?

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Old 02-22-2004, 01:40 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
You probably have a bad starter.

What you have is not enough spring tention in the solenoid to move the pinion which is under load off the flywheel ring gear. It is usually a matter of lubrication somewhere, probably on the solenoid piston which is not servicable on Bosch solenoids. It could just be a lack of lube on the pinion drive bushing and armature shaft. The pinion drive (starter drive) must slide back on the shaft for the solenoid to disengage electrically.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 02-22-2004, 02:14 PM
Registered User
Join Date: Nov 2002
Location: Nebraska
Posts: 58
Thanks Steve, I will dig into it and see if I can squirt a little lube in there.

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